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CN-122016217-A - Propeller collision test device and test method thereof

CN122016217ACN 122016217 ACN122016217 ACN 122016217ACN-122016217-A

Abstract

The invention discloses a screw collision test device and a test method thereof, wherein the screw collision test device comprises a closed test cabin provided with refrigeration equipment, a first installation platform plate which is arranged in the closed test cabin and is used for bearing a screw, a driving assembly which is arranged on the first installation platform plate and is used for driving the screw to rotate, a second installation platform plate which is used for bearing an ice sample, an ice outlet assembly which is arranged above the second installation platform plate and is used for supplying the ice sample and adjusting the collision angle of the ice sample and the screw, and a measuring assembly which is arranged in the closed test cabin and is used for synchronously measuring images and load data in the collision process of the screw and the ice sample. The invention can realize the collision tests with different heights and different collision angles, and the heights and the angles of the tests are flexibly set, thereby being convenient for repeating the collision tests under the same working condition.

Inventors

  • CHEN WENWEN
  • ZHANG JIAN
  • HUA SHI

Assignees

  • 江苏科技大学

Dates

Publication Date
20260512
Application Date
20260319

Claims (10)

  1. 1. The screw collision test device is characterized by comprising a closed test cabin (1) provided with refrigeration equipment, a first installation platform plate (3) which is arranged in the closed test cabin (1) and is used for bearing a screw (2) and is adjustable in height, a driving component which is arranged on the first installation platform plate (3) and is used for driving the screw (2) to rotate, a second installation platform plate (4) which is used for bearing an ice sample, an ice outlet component which is arranged above the second installation platform plate (4) and is used for supplying the ice sample and adjusting the collision angle of the ice sample and the screw (2), and a measuring component which is arranged in the closed test cabin (1) and is used for synchronously measuring the image and load data in the collision process of the screw (2) and the ice sample.
  2. 2. The device for the collision test of the propeller as set forth in claim 1, wherein the measuring assembly comprises a temperature sensor which is arranged on one side of the second mounting platform plate (4) close to the first mounting platform plate (3) and is used for measuring the temperature of the propeller (2), a camera (5) which is arranged on one side of the second mounting platform plate (4) and is used for taking pictures, a load sensor which is arranged on the driving assembly and is used for measuring the load, a pulse trigger which is arranged at the outlet end of the ice discharging assembly, and a data acquisition device which synchronously acquires the data of the camera (5) and the load sensor after receiving the trigger signal of the pulse trigger.
  3. 3. The propeller collision test device according to claim 1, wherein the driving assembly comprises a first driving motor (9) fixedly installed on the first installation platform plate (3), a transmission shaft (10) fixedly connected with an output shaft of the first driving motor (9), and a bearing support seat (11) fixedly installed on the first installation platform plate (3) and used for supporting the transmission shaft (10), a bearing for assisting the transmission shaft (10) to rotate is installed on the bearing support seat (11), and the propeller (2) is fixedly connected with one end, far away from the first driving motor (9), of the transmission shaft (10).
  4. 4. The screw collision test device according to claim 1, wherein the ice discharging assembly comprises an ice sample heat preservation channel (12) horizontally arranged above the second mounting platform plate (4) and connected with the closed test cabin (1) in a communicated mode, an ice sample vertical blanking pipe (13) vertically connected with the outlet end of the ice sample heat preservation channel (12) in a communicated mode, an ice sample guiding discharging pipe (14) rotatably connected with the outlet end of the ice sample vertical blanking pipe (13) and an adjusting piece mounted on the second mounting platform plate (4) and used for supporting the ice sample guiding discharging pipe (14) and adjusting the angle of the ice sample guiding discharging pipe.
  5. 5. The device for the collision test of the propeller as set forth in claim 5, wherein the second mounting platform plate (4) is provided with an arc guide rail (15), the adjusting piece comprises a support column (16) fixedly mounted at the bottom of the ice sample guide discharging pipe (14) and sliding along the arc guide rail (15), a second driving motor (17) fixedly mounted on the second mounting platform plate (4), and a connecting rod (18) with one end fixedly connected with an output shaft of the second driving motor (17) and the other end fixedly connected with the support column (16).
  6. 6. The device for testing the collision of a propeller according to claim 4, wherein the joint of the ice-like vertical blanking pipe (13) and the ice-like guiding discharging pipe (14) is provided with a smooth transition section (19), and the radius of the smooth transition section (19) Satisfy the following requirements Wherein For a preset maximum normal acceleration during ice-like movement, Refers to the speed of ice sample falling through the ice sample vertical blanking pipe (13), and Wherein Is the height of an ice-like vertical blanking pipe (13).
  7. 7. A propeller collision test method is characterized by comprising the following steps, S1, regulating and controlling a lifting supporting mechanism (7) to enable a first mounting platform plate (3) to move to a preset collision height, regulating and controlling a regulating piece to enable an ice outlet of an ice outlet assembly to rotate to a preset collision angle, and regulating and controlling refrigeration equipment to enable the temperature in a closed test cabin (1) to reach a preset test temperature; S2, performing zero calibration and calibration on the load sensor, setting the sampling frequency and the measuring range of the load sensor, starting the data acquisition device and the camera (5), and setting the synchronous data acquisition mode of the data acquisition device; S3, starting a first driving motor (9), and controlling a data acquisition device to acquire baseline load data of idling of the propeller (2) with specified duration under the action of current temperature stress after the first driving motor (9) drives the propeller (2) to rotate at a constant speed, and synchronously acquiring the baseline temperature measured by a temperature sensor; S4, releasing an ice sample at the inlet end of the ice sample heat preservation channel (12), and sliding the ice sample out through the ice sample heat preservation channel (12), the ice sample vertical blanking pipe (13) and the ice sample guide discharging pipe (14); S5, triggering and starting the video camera (5) and the data acquisition device when the pulse trigger detects that the ice sample slides out of the ice sample guide discharging pipe (14), so that the data acquisition device synchronously acquires image frames shot by the video camera (5) and load data measured by the load sensor, and recording the moment when the ice sample slides out of the ice sample guide discharging pipe (14) as the starting moment; S6, after the preset collision time is reached, controlling the data acquisition device to stop acquisition, and stopping the first driving motor (9); S7, drawing an original load curve based on load data from the starting moment to the ending moment of the data collector, and compensating the original load curve based on the baseline load data to obtain a target load curve; S8, storing the target load curve and the image frame corresponding to the target load curve as a test data set of the test; And S9, repeating the steps S3 to S8 until the number of the obtained test data sets reaches a preset value if a plurality of groups of test data sets at the current collision height, the collision angle and the test temperature are to be obtained, returning to the step S1 if the test data sets at different collision heights, different collision angles and different test temperatures are to be obtained, and repeating the steps S2 to S8 after the collision heights, the collision angles and the test temperatures are respectively regulated to the corresponding preset values.
  8. 8. The method of claim 7, wherein the range of the load sensor comprises a collision force range And torque range Calculating the collision force range And torque range The way of (2) is as follows: , wherein Refers to the safety coefficient, and The value range of (3) is [1.2,2], Refers to the impulse of the ice sample when the ice sample slides out of the ice sample guiding discharging pipe (14), Refers to the torque of the propeller (2), and R is the equivalent radius of the propeller (2); wherein Refers to the mass of the ice sample, and the mass of the ice sample, Refers to the time when the ice sample is completely broken when the ice sample contacts with the propeller (2); refers to the relative speed of collision of the ice sample and the propeller (2), and , Refers to the tangential velocity of the propeller (2) at the equivalent radius r, and , Wherein Is the angular velocity of the propeller (2), Is the rotational speed of the propeller (2).
  9. 9. The method according to claim 7, wherein the means for synchronously collecting data by the data collector in step S2 includes a to-be-triggered buffer for synchronously collecting the image frame currently photographed by the camera (5) and the load data currently measured by the load sensor from the start time, and a pre-triggered buffer for synchronously collecting the load data from the data collector before the start time Or afterwards Load data of the moment and an image frame taken at the current moment of the camera (5), The buffer time is preset.
  10. 10. The method according to claim 7, wherein the target load curve is obtained in step S7 by calculating an average value of baseline load data collected by the propeller (2) in a specified period of time and subtracting the average value from the original load curve.

Description

Propeller collision test device and test method thereof Technical Field The invention belongs to the technical field of propeller tests, and particularly relates to a propeller collision test device and a test method thereof. Background With polar shipping, polar resource development, and increased activity in cold region offshore engineering, sailing of ships in ice regions has become increasingly common. In the sailing process of the ice region, the propeller inevitably contacts and collides with ice cubes with different sizes, shapes and strengths, the propeller blades bear transient impact loads, and the blades can be bent and deformed or even the transmission system is damaged when serious, so that the safety of the ship propulsion in the ice region is threatened. Therefore, the ice-propeller collision test is carried out under the controllable condition, the stress response and the ice-like damage characteristic of the propeller under different working conditions are obtained, and the method has important significance for the design and the safety evaluation of the propeller in the ice region. The existing ice-screw collision test device is arranged by a pool or an open-type test bed, a screw model is installed on a fixing device, and then the ice sample is close to the screw by utilizing gravity through a vertical support, so that the impact working condition of ice cubes and blades is simulated. However, the prior art still has the defects that firstly, the preparation and the preservation of the ice sample are often carried out in independent low-temperature environments (such as an ice warehouse and a refrigerator), the propeller test device is arranged in a common laboratory or a water pool environment, the consistency of the ice sample state in multiple tests is difficult to maintain in the process of preparing and transferring the ice sample into the test device, so that the mechanical properties of the ice sample change, and secondly, the track and the collision mode of the ice sample approaching the propeller are basically fixed in a conventional device, so that the requirements of different tests are difficult to meet. Disclosure of Invention The first object of the invention is to provide a propeller collision test device which can maintain test consistency and meet different test requirements. A second object of the present invention is to provide a propeller collision test method. The invention discloses a screw collision test device which comprises a closed test cabin provided with refrigeration equipment, a first installation platform plate which is arranged in the closed test cabin and is used for bearing a screw, a driving assembly which is arranged on the first installation platform plate and is used for driving the screw to rotate, a second installation platform plate which is used for bearing an ice sample, an ice outlet assembly which is arranged above the second installation platform plate and is used for supplying the ice sample and adjusting the collision angle of the ice sample and the screw, and a measuring assembly which is arranged in the closed test cabin and is used for synchronously measuring images and load data in the collision process of the screw and the ice sample. Further, the measuring assembly comprises a temperature sensor which is arranged on one side of the second mounting platform plate close to the first mounting platform plate and used for measuring the temperature of the propeller, a camera which is arranged on one side of the second mounting platform plate and used for taking pictures, a load sensor which is arranged on the driving assembly and used for measuring load, a pulse trigger which is arranged at the outlet end of the ice discharging assembly, and a data collector which synchronously collects the data of the camera and the load sensor after receiving the triggering signal of the pulse trigger. Further, the driving assembly comprises a first driving motor fixedly installed on the first installation platform plate, a transmission shaft fixedly connected with an output shaft of the first driving motor, and a bearing support seat fixedly installed on the first installation platform plate and used for supporting the transmission shaft, an auxiliary transmission shaft rotating bearing is installed on the bearing support seat, and the propeller is fixedly connected with one end, far away from the first driving motor, of the transmission shaft. Further, the ice discharging assembly comprises an ice sample heat preservation channel which is horizontally arranged above the second mounting platform plate and is communicated and connected with the closed test cabin at the inlet end, an ice sample vertical discharging pipe which is vertically communicated and connected with the outlet end of the ice sample heat preservation channel, an ice sample guiding discharging pipe which is rotationally connected with the outlet end of the ice sample vertical dischargin